package com.webserver.core;

import com.webserver.annotation.Controller;
import com.webserver.annotation.RequestMapping;
import com.webserver.controller.UserController;
import com.webserver.http.HttpServeletRequest;
import com.webserver.http.HttpServeletResponse;

import java.io.File;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.URISyntaxException;

public class DispatcherServlet {
    //单例
    private static DispatcherServlet instance = new DispatcherServlet();
    private DispatcherServlet() {}
    public static DispatcherServlet getInstance(){ return instance; }

    //找到类加载路径的static目录
    private static File root;
    private static File staticDir;
    static {
        try {
            root = new File(
              DispatcherServlet.class.getClassLoader().getResource(".").toURI()
            );
            staticDir = new File(root,"static");
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }
    }
   public void service(HttpServeletRequest request,HttpServeletResponse response) throws IOException, ClassNotFoundException {
        String path = request.getRequestURI();
       Method method = HandlerMapping.getMethod(path);
       if (method!=null){
           try {
               Object obj = method.getDeclaringClass().newInstance();
               method.invoke(obj,request,response);
           } catch (Exception e) {
               response.setStatusCode(500);
               response.setStatusReason("Internal Server Erro");
               response.setContentFile(new File(staticDir,"/500.html"));
           }
       }else {
           File file = new File(staticDir,path);
           if (file.isFile()){
               response.setContentFile(file);
           }else {
               response.setStatusCode(404);
               response.setStatusReason("NotFound");
               file = new File(staticDir,"/404.html");
               response.setContentFile(file);
           }
       }


       response.addHeasers("Server","BirdServer");


   }



}
